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Relying on memory, I believe that the unit is a two fuel line setup. There would be O Rings in the dual fuel/air line connector that is attached to the end of the fuel hose. The part number of the O Rings is 301824.
Sorry my friend bnut I don't understand your reply. The part number is not for any website, it is a OMC (now Bombardier) part number for the O rings. They would be available at any Evinrude/Johnson dealership.
Here's the service bulletin on installing the o-rings. Beware, wherever you get the new ones, they may want to substitute Sierra for BRP. Sierra are slightly larger and more difficult to install.
BoatBuoy.... Yea, I just checked my book and those numbers as you state are correct. I wonder if Sierra is in error as they have 18-7111 compatable with 301824 but there's obviously a difference.